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Infection and Immunity, July 2001, p. 4217-4223, Vol. 69, No. 7
Infection and Immunity Group, Institute of
Immunology, National University of Ireland, Maynooth, County
Kildare,1 and Department of Physiology,
Trinity College Institute of Neuroscience, Trinity College,
Dublin,2 Ireland
Received 31 January 2001/Returned for modification 14 March
2001/Accepted 3 April 2001
Immunization with the whole-cell pertussis vaccine (Pw), while
effective at preventing whooping cough in infants, has been associated
with local, systemic, and neuronal reactions, including fevers and
convulsions in children. In contrast, the new acellular pertussis
vaccines (Pa) have a considerably improved safety profile. The lack of
an appropriate animal model has restricted investigations into the
mechanisms by which neurological reactions are induced by vaccination.
Here we describe a novel murine model wherein seizure-like behavioral
changes are induced following parenteral administration of Pw. The
proinflammatory cytokine interleukin-
0019-9567/01/$04.00+0 DOI: 10.1128/IAI.69.7.4217-4223.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Whole-Cell but Not Acellular Pertussis Vaccines Induce Convulsive
Activity in Mice: Evidence of a Role for Toxin-Induced
Interleukin-1
in a New Murine Model for Analysis of Neuronal
Side Effects of Vaccination
(IL-1
), production of which
has been associated with many neurodegenerative conditions, was
significantly increased in the hippocampus and hypothalamus of
vaccinated animals. Accompanying this change was a decrease in release
of the inhibitory neurotransmitters
-aminobutyric acid and adenosine
in the hippocampus. Seizure-like behavioral changes were significantly
reduced following inhibition of IL-1
production by the
administration of an inhibitor of IL-1
-converting enzyme and were
almost completely abrogated in IL-1 receptor type I knockout mice.
These results suggest a causal relationship between IL-1
induction
and convulsive behavior following Pw vaccination. Significantly, Pa
neither increased IL-1
nor induced behavioral changes in mice, but
did induce the anti-inflammatory cytokine IL-10. In contrast,
administration of active pertussis toxin and lipopolysaccharide,
residual in Pw but absent from Pa, also induced convulsive activity.
Our findings provide the first direct evidence of an immunological
basis for pertussis vaccine reactogenicity and suggest that active
bacterial toxins are responsible for the neurologic disturbances
observed in children immunized with Pw.
*
Corresponding author. Mailing address: Infection and
Immunity Group, Institute of Immunology, National University of
Ireland, Maynooth, Co. Kildare, Ireland. Phone: 353-1-7083838. Fax:
353-1-7083845. E-mail: kingston.mills{at}may.ie.
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